Bearing flags and angry hand-lettered signs, legions of demonstrators gathered at the Lincoln Memorial, thronged outside the White House and marched across the District. What awaited them was a city that no longer felt as if it was being occupied by its own country’s military.

Tests of the first two Avelia Liberty high-speed train sets are underway in the Northeast Corridor and at a federal facility in Pueblo, Colo., and railroad crews have started training on the new technology in anticipation of a launch next spring, Amtrak officials said.

What’s been unfolding inside the Pittsburgh Post-Gazette has underscored one of the fundamental challenges American media faces with its coverage: a lack of diverse voices, including of black journalists, in newsrooms.

The scientists sent Mark Zuckerberg a letter calling the social media site’s lax policy enforcement around inaccurate information and incendiary language contrary to the Chan Zuckerberg Initiative’s mission.

Their high school years have been punctuated by protests for women's rights, safe schools, racial justice and climate change. But most have never come face to face with police in riot gear, or military vehicles lining streets before.